How to use org.jfree.data.statistics

 HistogramDataset dataset = new HistogramDataset();
dataset.addSeries("series label",arrayOfValues,noOfBins);

  datasetList.add(new DefaultBoxAndWhiskerCategoryDataset());
datasetList.get(i).add(
    distributionLevelList.get(i),
    solverLabel,

 HistogramDataset dataset = new HistogramDataset();
dataset.setType(HistogramType.RELATIVE_FREQUENCY);
dataset.addSeries("H1", double[], 20);

HistogramDataset dataset = new HistogramDataset();
double[] values = {1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0};
dataset.addSeries("H1", values, 10, 0.0, 10.0);

/**
 * Adds a list of values relating to one box-and-whisker entity to the
 * table.  The various median values are calculated.
 *
 * @param list  a collection of values from which the various medians will
 *              be calculated.
 * @param rowKey  the row key ({@code null} not permitted).
 * @param columnKey  the column key ({@code null} not permitted).
 *
 * @see #add(BoxAndWhiskerItem, Comparable, Comparable)
 */
public void add(List list, Comparable rowKey, Comparable columnKey) {
  BoxAndWhiskerItem item = BoxAndWhiskerCalculator
      .calculateBoxAndWhiskerStatistics(list);
  add(item, rowKey, columnKey);
}

/**
 * Adds an observation to the dataset (by incrementing the item count for
 * the appropriate bin).  A runtime exception is thrown if the value does
 * not fit into any bin.
 *
 * @param value  the value.
 */
public void addObservation(double value) {
  addObservation(value, true);
}

/**
 * Returns the value for an item (for this dataset, the mean value is
 * returned).
 *
 * @param rowKey  the row key.
 * @param columnKey  the columnKey.
 *
 * @return The value (possibly <code>null</code>).
 */
public Number getValue(Comparable rowKey, Comparable columnKey) {
  return getMeanValue(rowKey, columnKey);
}

/**
 * Returns the starting Y value for the specified series and item.
 *
 * @param series  the series index (zero-based).
 * @param item  the item index (zero-based).
 *
 * @return The value.
 */
@Override
public Number getStartY(int series, int item) {
  return getY(series, item);
}

/**
 * Returns the mean of an array of numbers.  This is equivalent to calling
 * {@code calculateMean(values, true)}.
 *
 * @param values  the values ({@code null} not permitted).
 *
 * @return The mean.
 */
public static double calculateMean(Number[] values) {
  return calculateMean(values, true);
}

/**
 * Returns the end y-value (as a double primitive) for an item within a
 * series.
 *
 * @param series  the series index (zero-based).
 * @param item  the item index (zero-based).
 *
 * @return The end y-value.
 */
public double getEndYValue(int series, int item) {
  return getYValue(series, item);
}

/**
* Gets the current name of the selected series.
* 
* @param series series index.
* 
*    @return current name of the series.
* 
*/
public String getName (int series)  {
 return (String)((DefaultBoxAndWhiskerCategoryDataset)seriesCollection).getColumnKey(series);
}

/**
 * Adds an observation to the dataset (by incrementing the item count for
 * the appropriate bin).  A runtime exception is thrown if the value does
 * not fit into any bin.
 *
 * @param value  the value.
 */
public void addObservation(double value) {
  addObservation(value, true);
}

/**
 * Returns the value for an item (for this dataset, the mean value is
 * returned).
 *
 * @param rowKey  the row key.
 * @param columnKey  the columnKey.
 *
 * @return The value (possibly {@code null}).
 */
@Override
public Number getValue(Comparable rowKey, Comparable columnKey) {
  return getMeanValue(rowKey, columnKey);
}

/**
 * Returns the ending Y value for the specified series and item.
 *
 * @param series  the series index (zero-based).
 * @param item  the item index (zero-based).
 *
 * @return The value.
 */
@Override
public Number getEndY(int series, int item) {
  return getY(series, item);
}

/**
 * Returns the mean of a collection of {@code Number} objects.
 *
 * @param values  the values ({@code null} not permitted).
 *
 * @return The mean.
 */
public static double calculateMean(Collection values) {
  return calculateMean(values, true);
}

/**
 * Returns the start y-value (as a double primitive) for an item within a
 * series.
 *
 * @param series  the series index (zero-based).
 * @param item  the item index (zero-based).
 *
 * @return The start y-value.
 */
public double getStartYValue(int series, int item) {
  return getYValue(series, item);
}

/**
 * Returns the starting Y value for the specified series and item.
 *
 * @param series  the series index (zero-based).
 * @param item  the item index (zero-based).
 *
 * @return The value.
 */
public Number getStartY(int series, int item) {
  return getY(series, item);
}

/**
 * Returns the mean of an array of numbers.  This is equivalent to calling
 * <code>calculateMean(values, true)</code>.
 *
 * @param values  the values (<code>null</code> not permitted).
 *
 * @return The mean.
 */
public static double calculateMean(Number[] values) {
  return calculateMean(values, true);
}

/**
 * Returns the end y-value (as a double primitive) for an item within a
 * series.
 *
 * @param series  the series index (zero-based).
 * @param item  the item index (zero-based).
 *
 * @return The end y-value.
 */
@Override
public double getEndYValue(int series, int item) {
  return getYValue(series, item);
}

/**
 * Returns the ending Y value for the specified series and item.
 *
 * @param series  the series index (zero-based).
 * @param item  the item index (zero-based).
 *
 * @return The value.
 */
public Number getEndY(int series, int item) {
  return getY(series, item);
}

/**
 * Returns the mean of a collection of <code>Number</code> objects.
 *
 * @param values  the values (<code>null</code> not permitted).
 *
 * @return The mean.
 */
public static double calculateMean(Collection values) {
  return calculateMean(values, true);
}